Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_NAMEI_H
2#define _LINUX_NAMEI_H
3
4#include <linux/dcache.h>
5#include <linux/linkage.h>
6
7struct vfsmount;
8
9struct open_intent {
10 int flags;
11 int create_mode;
12 struct file *file;
13};
14
15enum { MAX_NESTED_LINKS = 8 };
16
17struct nameidata {
18 struct dentry *dentry;
19 struct vfsmount *mnt;
20 struct qstr last;
21 unsigned int flags;
22 int last_type;
23 unsigned depth;
24 char *saved_names[MAX_NESTED_LINKS + 1];
25
26 /* Intent data */
27 union {
28 struct open_intent open;
29 } intent;
30};
31
32/*
33 * Type of the last component on LOOKUP_PARENT
34 */
35enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
36
37/*
38 * The bitmask for a lookup event:
39 * - follow links at the end
40 * - require a directory
41 * - ending slashes ok even for nonexistent files
42 * - internal "there are more path compnents" flag
43 * - locked when lookup done with dcache_lock held
44 * - dentry cache is untrusted; force a real lookup
45 */
46#define LOOKUP_FOLLOW 1
47#define LOOKUP_DIRECTORY 2
48#define LOOKUP_CONTINUE 4
49#define LOOKUP_PARENT 16
50#define LOOKUP_NOALT 32
51#define LOOKUP_REVAL 64
52/*
53 * Intent data
54 */
55#define LOOKUP_OPEN (0x0100)
56#define LOOKUP_CREATE (0x0200)
57#define LOOKUP_ACCESS (0x0400)
58#define LOOKUP_CHDIR (0x0800)
59
60extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
61extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
62#define user_path_walk(name,nd) \
63 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
64#define user_path_walk_link(name,nd) \
65 __user_walk_fd(AT_FDCWD, name, 0, nd)
66extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
67extern int FASTCALL(path_walk(const char *, struct nameidata *));
68extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
69extern void path_release(struct nameidata *);
70extern void path_release_on_umount(struct nameidata *);
71
72extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
73extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
74extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
75 int (*open)(struct inode *, struct file *));
76extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
77extern void release_open_intent(struct nameidata *);
78
79extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
80
81extern int follow_down(struct vfsmount **, struct dentry **);
82extern int follow_up(struct vfsmount **, struct dentry **);
83
84extern struct dentry *lock_rename(struct dentry *, struct dentry *);
85extern void unlock_rename(struct dentry *, struct dentry *);
86
87static inline void nd_set_link(struct nameidata *nd, char *path)
88{
89 nd->saved_names[nd->depth] = path;
90}
91
92static inline char *nd_get_link(struct nameidata *nd)
93{
94 return nd->saved_names[nd->depth];
95}
96
97#endif /* _LINUX_NAMEI_H */